{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-23-017934","form_type":"8-K/A","ticker":"KOP","cik":"0001315257","company_name":"Koppers Holdings Inc.","filed_at":"2023-05-04T23:59:59+00:00","discovered_at":"2026-05-14T18:03:38.350124+00:00","generated_at":"2026-06-15T21:00:56.320421+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.2,"calibrated_materiality_score":0.2,"confidence":"high","headline":"Koppers assigns new director Sandifer to Audit, Governance, and Strategy committees","bullets":["Andrew D. Sandifer appointed to Audit Committee effective May 4, 2023.","Also appointed to Nominating and Corporate Governance Committee.","Also appointed to Strategy and Risk Committee.","This amends the original March 22, 2023 8-K that reported his election."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-23-017934","json":"https://secwatch.observer/filing/0000950170-23-017934.json","markdown":"https://secwatch.observer/filing/0000950170-23-017934.md","text":"https://secwatch.observer/filing/0000950170-23-017934.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1315257/000095017023017934/0000950170-23-017934-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1315257/000095017023017934/kop-20230504.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-15T21:00:56.320421+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}